Hey everyone!
I worked for hours on my own theme today I was very happy that is very simple - even for me as a noob.
After some changes .... I became aware of a plugin. I installed it and suddenly my nodebb-theme-x folder was deleted. -_-
For my theme I just followed the tutorial on github / the documents.
Have any of you ever had the same problem? Or can you tell me what I was doing wrong? That was the second time that this happened to me. But today I became aware of the reason. 
What do I have to do to ensure that my nodebb-theme-x folder is not deleted after running npm install >module<
Greets